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SPECIAL TOPICS

High-Temperature Superconductors

Published: February 2009
Revised: April 2009*

 

The baseline time span for this database is (publication years) 1999-February, 2009 which is the first bimonthly period 2009 (a 10-year + 2-month period). The resulting database contained 10,224 (10 years) and 1,976 (2 years) papers; 15,062 authors; 86 nations; 615 journals; and 3,217 institutions. See additional paper information below in the overview & methodology sections.

Top 20 Papers

  10-year period
  2-year period

Top 20 Overall

  Authors
  Institutions
  Journals
  Nations

Research Front Map

  Map title: "COPPER OXIDE SUPERCONDUCTORS"
  Map title: "IRON-BASED LAYERED SUPERCONDUCTORS"
  Map title: "UNCONVENTIONAL COBALT OXIDE SUPERCONDUCTORS"
  Map title: "QUANTUM COMPUTING: SUPERC ONDUCTING QUANTUM BITS (QUBITS)"

Time Series

  1- & 5-year periods

Field Distribution

Interviews

  Interviews, first-person essays, and profiles about people in a wide variety of fields which pertain to this special topic of High-Temperature Superconductors.
   

OVERVIEW

High-temperature superconductors are materials with a superconducting transition temperature greater than 30 K. Because these materials were thought to be insulators rather than conductors, their discovery in the 1980s by Alex Müller and Georg Bednorz made the research community buzz with excitement.

This month, ScienceWatch.com examines the literature on high-temperature superconductors. Our search was based on a long string of keywords of original articles, review papers, and proceedings papers published between January 1, 1999 and February 28, 2009.

To generate a more on-point list of the top 20 papers over the past decade and over the past two years, we further restricted these papers to the contain the keywords "superconduct*" in the title.

The most-cited paper over the past decade in this subset is the 1999 Reports on Progress in Physics paper, "The pseudogap in high-temperature superconductors: An experimental survey," by Tom Timusk, Professor Emeritus at McMaster University, and the late Bryan Statt, who was a professor at the University of Toronto.

Other topics covered in the top 20 papers include photoemissions studies, pairing symmetry, magnetic properties, fluctuating stripes, tunneling effects, currents, and electric power applications. Cuprates and yttrium superconductors are the most discussed in this set of papers.

The two-year list of papers deals with such subjects as the Nerst effect, quantum criticality, impurity-induced states, superconducting wires, pair formation, photoemission spectra, energy gaps, and electronic spectra. The superconductive abilities of a variety of materials are also explored, including SmFeAsO1-xFx, LaO1-xFxFeAs, copper oxides, gadolinium-arsenide oxides, YBCO, and BSCCO.

Details: It should be noted that this analysis has been corrected, as the original analysis posted in February was found to be lacking in terms of an accurate picture of the field. The decision was made to streamline the keywords and include proceedings papers in order to improve the quality of the analysis.

Methodology:

Overall: The baseline time span for this database is (publication years) 1999-February, 2009 which is the first bimonthly period 2009 (a 10-year + 2-month period). The resulting database contained 10,224 (10 years) and 1,976 (2 years) papers; 15,062 authors; 86 nations; 615 journals; and 3,217 institutions. See additional paper information below.

Papers: To construct the top 20 papers lists for the past decade and the past two years, the papers were further narrowed down by the title keyword "superconduct*." This adjustment resulted in the top 20 papers being selected from a pool of 3,314 (10 years) and 706 (2 years) papers.

Rankings: Once the database was in place, it was used to generate list of authors, journals, institutions, and nations. Rankings for author, journal, institution, and country are listed in three ways: according to total cites, total papers, and total cites/paper. The paper thresholds and corresponding percentages used to determine scientist, institution, country, and journal rankings according to total cites/paper, and total papers respectively are as follows:

Entity Authors Institutions Nations Journals
Thresholds 29 88 26 2
Percentage: 1% 1% 50% 50%

        



Analyses : Special Topics : High-Temperature Superconductors
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